And Beautrelet suddenly closed his eyes and convulsively pressed his folded arms to his forehead. Over there—oh, he felt as though he would die for joy, so great was the cruel emotion that wrung his heart!—over there, almost at the top of the Needle of Étretat, a little below the extreme point round which the sea-mews fluttered, a thread of smoke came filtering through a crevice, as though from an invisible chimney, a thread of smoke rose in slow spirals in the calm air of the twilight. CHAPTER NINE OPEN, SESAME! The Étretat Needle was hollow! Was it a natural phenomenon, an excavation produced by internal cataclysms or by the imperceptible action of the rushing sea and the soaking rain? Or was it a superhuman work executed by human beings, Gauls, Celts, prehistoric men? These, no doubt, were insoluble questions; and what did it matter? The essence of the thing was contained in this fact: The Needle was hollow. At forty or fifty yards from that imposing arch which is called the Porte d’Aval and which shoots out from the top of the cliff, like the colossal branch of a tree, to take root in the submerged rocks, stands an immense limestone cone; and this cone is no more than the shell of a pointed cap poised upon the empty waters! A prodigious revelation! After Lupin, here was Beautrelet discovering the key to the great riddle that had loomed over more than twenty centuries! A key of supreme importance to whoever possessed it in the days of old, in those distant times when hordes of barbarians rode through and overran the old world! A magic key that opens the cyclopean cavern to whole tribes fleeing before the enemy! A mysterious key that guards the door of the most inviolable shelter! An enchanted key that gives power and ensures preponderance! Because he knows this key, Cæsar is able to subdue Gaul. Because they know it, the Normans force their sway upon the country and, from there, later, backed by that support, conquer the neighboring island, conquer Sicily, conquer the East, conquer the new world! Masters of the secret, the Kings of England lord it over France, humble her, dismember her, have themselves crowned at Paris. They lose the secret; and the rout begins. Masters of the secret, the Kings of France push back and overstep the narrow limits of their dominion, gradually founding a great nation and radiating with glory and power. They forget it or know not how to use it; and death, exile, ruin follow. An invisible kingdom, in mid-water and at ten fathoms from land! An unknown fortress, taller than the towers of Notre Dame and built upon a granite foundation larger than a public square! What strength and what security! From Paris to the sea, by the Seine. There, the Havre, the new town, the necessary town. And, sixteen miles thence, the Hollow Needle, the impregnable sanctuary!